Question

What's the fastest way to multiply 2 digit numbers up to 100 mentally?

Answer 1

Answer:

This mental multiplication trick uses the idea of a third number - a base number - to help us multiply two numbers in your head. This lesson looks at multiplying numbers near 10 using base 10. Fast Mental Multiplication Trick - Multiply in your head using base 20 and 30 How to multiply numbers near 20 and 30

Hope it helps

Answer 2

Hi there!

The fastest way to multiply 2 digit numbers up tp 100 is 50.

we can directly divide 100 by 2.

a × b = ab

suppose we replace a with 50 and b with 2

50 × 2 = 100

replace 50 with a again.

a × 2 = 100

a = 100/2

a = 50

100/2 is the fastest way